I'm also desperately looking for an older version.
I did e-mail support about the new version and problems experienced, but no reply yet.
My phone updated the app over the weekend, now it has the new skin etc, but it's completely useless.
I can open the app and play tracks, but I can't access any of the options available when pushing the MENU button (e.g. to change the speed of playback, or to exit the app).
Every single option causes the app to crash with the following error:
THE PROCESS ASTRO PLAYER PRO (PROCESS COM.ASTROPLAYERKEY) HAS STOPPED UNEXPECTEDLY. PLEASE TRY AGAIN [FORCE CLOSE]
I see there was an update released again yesterday, but this hasn't made any difference, it's still crashing.
I'm VERY unhappy, I especially bought this app to take to the gym and it's no longer serving my needs.
Pity, especially after showing it to so many people there and recommending it to them.